6017 savecore's messages about read errors are useless

@@ -264,12 +264,12 @@
 
 static void
 Fread(void *buf, size_t size, FILE *f)
 {
         if (fread(buf, size, 1, f) != 1)
-                logprint(SC_SL_ERR | SC_EXIT_ERR, "fread: ferror %d feof %d",
-                    ferror(f), feof(f));
+                logprint(SC_SL_ERR | SC_EXIT_ERR, "fread: %s",
+                    strerror(errno));
 }
 
 static void
 Fwrite(void *buf, size_t size, FILE *f)
 {